Guam - The Department of Corrections has launched an internal affairs investigation into the assault of Chad Desoto yesterday. According to DOC Spokesperson Jeff Limo, Desoto was assaulted by another detainee inside the Behavioral Housing Unit. Desoto is on trial for driving a car down a crowded street in Tumon last year. He crashed his car into the ABC Store underneath the Outrigger Resort, jumped out and started stabbing people randomly. Three people died and several others were injured. He has pleaded not guilty by reason of mental illness. Closing arguments in his case are scheduled for this afternoon.